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23 Service Manual
For internal use only
8. Leak test (leak indicator gauge)
The rate of leak is understood as the microwave energy that escapes from the oven despite intact leak
systems. It is measured with suitable measuring instruments as energy density at 5 cm intervals. A
measuring unit is mW/cm
2
. Limits for permissible readings and the conditions for measurement are sti-
pulated in VDE regulation 0700/No. 25. They are as follows:
8.1 Abnormal operation (no-load operation)
Microwave output power: Maximum 1000 W
Load: None (no-load operation)
Max. permissible reading: 10 mW / cm²
Measuring interval: 5 cm
8.2 Normal operation, loaded
Setting: Maximum power level of the appliance
Load: 275 cm
3
water
Permissible limit: 5 mW / cm
2
Spacing: 5 cm
This test is to be performed on the door, the lock, the microswitches and the magnetron every time
maintenance work has been carried out.
Test equipment
600 ml glass beaker
Microwave measuring instrument
Test procedure
1. Pour 250 ml of water into the beaker and then place this in the centre of the microwave oven.
2. Switch on the microwave oven. Set it to 5 minutes at the maximum power level.
3. Hold the test sensor of the microwave measuring instrument vertical to the door edge of the
appliance and slowly move it along.
The following areas must be tested for microwave leaks:
Door and control section
All ventilation slits
All folded joints
Weld on the underside
Base plate
Procedure:
1. Open the door just so much that the appliance is not switched off.
2. The distance between the door and the sensor must not be less than 5 cm.
The maximum admissible radiation leak is 4 mW / cm².
23


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